CME quiz on Impedance audiometry By drtbalu

Primay purpose of impedance audiometry is
1. To determine the quantum of sensorineural deafness
2. To determine the status of ear drum and middle ear
3. To determine the status of inner ear
4. To determine the status of vestibular apparatus
Features of impedance audiometry include
1. Determines the status of ear drum and middle ear
2. Secondary purpose of this investigation is to evaluate the acoustic reflex pathway
3. Results of this test should always be interpreted in conjunction with pure tone audiometry
4. This test clearly estimates the amount of sensorineural hearing loss
Impedance audiometry can be affected by
1. Mass, mobility and resistance systems of external and middle ear cavities
2. Inner ear pathology
3. Trigeminal nerve integrity
4. Integrity of semicircular canals
Tests included under impedance audiometry are
1. Tympanometry
2. Acoustic reflex threshold
3. Acoustic reflex decay
4. Eustachean tube function
Probe tone used in impedance audiometry is
1. 500 Hz
2. 1000 Hz
3. 226 Hz
4. 5000 Hz
While performing this test the pressure of external canal is varied between
1. +200 to -400 decapascals
2. + 50 to + 100 decapascals
3. 100 pascals to 400 pascals
4. +500 to +1000 decapascals
Once of the common errors while performing impedance audiometry is
1. Not using the proper stimulus frequency
2. Unable to obtain perfect airtight seal is obtained
3. Inability of patient to respond correctly whether the sound is heard or not
4. Inner ear pathologies
Impedance audiometry should not be performed in infants below the age of 7 months is
1. The infant may not be able to indicate whether the sound is heard or not
2. The suppleness of the cartilage of external canal may produce misleading results
3. The external canal is too narrow in an infant
4. Air tight seal cannot be obtained in an infant below the age of 7 months
Classification of various tympanometric curves was introduced by
1. Samuels
2. Manning
3. Jerger
4. Jardorfer
Impedance audiometry is useful in identifying
1. Middle ear effusion
2. Otosclerosis
3. Glue ear
4. Ossicular disruption
Maximum compliance occurs
1. When pressures in the external canal and middle ear are equal
2. When pressure in the external canal is lesser than that of middle ear
3. When the pressure in the middle ear is less than that of external ear
4. When the middle ear pressure is negative
Type A tympanogram curve indicates
1. Normal middle ear function
2. Secretory otitis media
3. Adhesive otitis media
4. Otosclerosis
Features of Type A tympanogram are
1. Indicates normal middle ear function
2. Compliance peak occur between -150 and + 100 dpa
3. Compliance peak occurs between -50 and -100 dpa
4. Compliance value is between 0.2 - 2.5 millimhos
What is the type of impedance curve shown herre
1. Type A
2. Type As
3. Type B
4. Type Ad
As type curve indicates
1. Normal middle ear
2. Glue ear
3. Normal inner ear function
4. Normal labyrinthine function
Features of Type As curve include
1. Shallow curve
2. Indicates compliant middle ear
3. Indicates stiffened middle ear
4. Compliance peak occurs at -150 to 100 dapa
Name this impedance curve
1. Type A curve
2. Type B curve
3. Type Ad curve
4. Type As curve
Type Ad impedance curve suggests
1. Normal middle ear fucntion
2. High compliance middle ear
3. Low compliance middle ear
4. Normal inner ear function
Features of Type Ad curve are
1. Suggests flaccid ear drum / middle ear system
2. Ossicular chain disruption
3. Recording never goes off the chart
4. Record goes off the chart
Name the type of impedance curve shown here
1. Type A curve
2. Type B curve
3. Type As curve
4. Type Ad curve
Type Ad curve is seen in
1. Ossicular chain disruption
2. Secretory otitis media
3. Adhesive otitis media
4. otosclerosis
Type B curve
1. Has an open peak
2. Has no compliance peak
3. Has a negative peak
4. Indicates compliant ear drum
Type B curve with normal canal volume suggests
1. Otosclerosis
2. Cerumen
3. Otitis media
4. Adhesive otitis media
Average ear canal volume in adults is
1. 3 ml
2. 0.63 - 1.46 ml
3. 10 ml
4. 20 ml
Average ear canal volume in a child is
1. 0.42 - 0.97 ml
2. 2 ml
3. 4 ml
4. 5 ml
Type B curve with large canal volume is a feature of
1. Cerumen
2. Otitis media
3. Perforated ear drum
4. Secretory otitis media
Type B curve with a small canal volume indicates
1. Cerumen
2. Otitis media
3. Ear drum perforation
4. Adhesive otitis media
Name the type of cure shown above
1. Type A
2. Type As
3. Type c
4. Type B
Features of Type C curve indicates
1. Significant negative middle ear pressure
2. Eustachean tube dysfunction
3. Peak occurs at - 150 dapa
4. Presence of cerumen can cause this curve
Name the type of curve shown above
1. Type A
2. Type C
3. Type B
4. Type As

CME quiz on Impedance audiometry By drtbalu

CME quiz on Tympanic membrane